Promote the Dev Spaces Gateway plugin on the JetBrains websites

There're a few places on the JetBrains websites where we can promote the Red Hat OpenShift Dev Spaces Gateway plugin:

• Describe the connection flow on https://www.jetbrains.com/help/idea/remote-development-a.html
• https://www.jetbrains.com/remote-development/. See the section "Backend orchestration tools".
• https://www.jetbrains.com/remote-development/gateway/. See the section "Where can I run my IDE’s backend?".
• https://www.jetbrains.com/help/idea/licensing-and-useful-links.html#legal_entities. See the section "The list of the authorized partners".